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13 May 2010 Absorbing photonic crystals for thin film photovoltaics
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The absorption of thin hydrogenated amorphous silicon layers can be efficiently enhanced through a controlled periodic patterning. Light is trapped through coupling with photonic Bloch modes of the periodic structures, which act as an absorbing planar photonic crystal. We theoretically demonstrate this absorption enhancement through one or two dimensional patterning, and show the experimental feasibility through large area holographic patterning. Numerical simulations show over 50% absorption enhancement over the part of the solar spectrum comprised between 380 and 750nm. It is experimentally confirmed by optical measurements performed on planar photonic crystals fabricated by laser holography and reactive ion etching.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
O. El Daif, E. Drouard, G. Gomard, X. Meng, A. Kaminski, A. Fave, M. Lemiti, E. Garcia Cavrel, P. Roca i Cabarrocas, S. Ahn, H. Jeon, and C. Seassal "Absorbing photonic crystals for thin film photovoltaics", Proc. SPIE 7713, Photonic Crystal Materials and Devices IX, 771308 (13 May 2010);

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